MO does not have matside weigh-ins. Wrestlers must weigh at the site before the duel or tournament, though. I'll give you a couple hypothetical scenarios. You're wrestling at a triangle, and all wrestlers weigh in, say, 1 hr before the duel starts. Team A is the home team; teams B and C wrestle first; then team A wrestles team B. If I'm on team B and am a 112 lber, then I'm probably not going to eat or drink jack the whole evening. If I'm on team A, then I'd get something to eat after weigh-in. If I'm on team C, then I'd get something to drink and maybe something to eat after the first duel. Team A should have the advantage. You could see a similar situation at a tournament where individuals would have advantages. Everybody weighs in the morning of the tournament. Maybe the 2nd-seeded wrestler at 112 has a bye the first round; so he has a couple hours before he wrestles and can get breakfast, etc. The 3rd-seeded wrestler has to wrestle the first round and doesn't feel like he has the time to eat breakfast before his match. Then, after the first round, the 3rd-seeded wrestler still doesn't have time to eat breakfast b/c he's wrestling the very next round. These are just hypothetical, though. I'd like to see weigh-ins like MO has them.
Why doesn't KS allow 3rd place to challenge 2nd place if the 2 never met in the tournament, like OK does? I'd like to see that too, although the 3rd place wrestler has an advantage there.